operational applications of satellite altimetry - ostm: home page

Operational Applications of Satellite Altimetry

Bob Leben

Colorado Center for Astrodynamics ResearchUniversity of Colorado, Boulder

University of Colorado, Boulder Colorado Center for Astrodynamics Research OSTM SWT Meeting • 19 June 2008 • Buellton, CA

Introduction

Since 1996, the Colorado Center for Astrodynamics Research(CCAR) has hosted near real-time maps of mesoscale SSHanomalies on the web to encourage operational use of satellitealtimetry.

In this presentation, I will highlight several example applicationsand data syntheses using satellite altimetry including: offshore operational support in the Gulf of Mexico, oceanographic survey design, marine mammal and sea turtle migration patterns related

to oceanographic circulation, and oceanographic consulting.


Offshore Operational Support: Gulf of Mexico

Data User: Capt. Karl Greig, captain of a large anchor handling tug boatowned by Edison Chouest Offshore.Application: Route finding for towing semi-submersible drilling rigs usedin deepwater oil and gas exploration.Operation: Moving a rig from Mississippi Canyon block 68 to MustangIsland block 68, a total of 425 nautical miles. Typical towing speeds are 3to 4 knots so avoiding and/or using eddy currents significantly reducestransit times, in this case by over 50 hours.Altimeter Product Used: Overlays of geostrophic velocity vectors oncolored magnitudes values accessed on CCAR website by satellite phone.Estimated Savings: $650,000 in rig downtime and towing costs.

Colorado Center for Astrodynamics ResearchUniversity of Colorado, Boulder OSTM SWT Meeting • 19 June 2008 • Buellton, CA

Near real-time currents: August 15, 2003

x x Mustang Island

lease block

Mississippi Canyonlease block


Survey Design: R/V Knorr Transatlantic VPR survey

Data User: Dennis McGillicuddy and Valery Kosnyrev, WHOI Application: Support of transatlantic research expedition from Malta toWoods Hole on the R/V Knorr, Chief Scientist Dr. Cabell Davis Operation: Identify eddy features to sample with the Video PlanktonRecorder, a video microscope mounted on an vehicle towed behind the ship.Altimeter Product Used: Near-real time along-track data, which were usedby the investigators in to map SSHA and select way points.


Sample altimeter data product and VPR images


Survey Design for Whale Survey MMS/NMFS


Online SSH/SST Overlay


SST with and without SSH Overlaid


Ocean Color with and without SSH Overlaid


Northern Fur Seal Wintertime Migration Patterns

Data User: Jeremy Sterling, fisheriesbiologist at the NOAA National MarineFisheries Laboratory.Application: Relating satellite-track positionand velocity data of northern fur seals duringwintertime migration in the North Pacific toobserved oceanographic conditions.Altimeter Product Used: Near-real time and historical mesoscale SSH anomaly data.


Satellite tracked northern fur seals

Fur seals linger near mesoscaleeddy features in North Pacificduring wintertime migration.


Jenifer Clark’s Gulf Stream

Data User: Jenifer Clark, professionalsatellite oceanographer.Application: General marine consulting. Operation: Using near real-time altimeterdata with sea surface temperature imageryto evaluate currents affecting offshoreoperations.Altimeter Product Used: Near-real time data SSH and geostrophic velocity dataviewers.


Jenifer Clark’s Gulf Stream

http://users.erols.com/gulfstrm/

Sailboat Races Ocean Routing Sea Surface Temperatures Fishing Charts Marine Consultation Boat Deliveries Current Analysis


Sport Sailing


Deep Sea Recovery

Assisted Phoenix International Corp. in their recovery of theNavy Helicopter CH-46 nearthe Gulf Stream in 10,000 ftdeep water off of the Virginiacoast in June 2002.


Design and Decision SupportTool: Gulf of Mexico

Data User: “Climatology and Simulation of Eddies” Eddy Joint Industry Project (CASE/EJIP)Application: Develop a synthetic time series of Loop Current andassociated eddies to use as input to a hurricane model to derive 50- to 1000-year design criteria for extreme hurricane/Loop Current events.Operation: Design and decision support for offshore exploration andproduction activities.Altimeter Product Used: Altimeter-derived Loop Current and LoopCurrent eddy positions and statistics.


Why is the Loop Current important?

KATRINA

←Katrina Path

Maximum sustained winds (mph)→


CCAR SSH Map Overlaid with Katrina Path/Sustained Winds


1969 Hurricane Camille

• Category 5 at landfall near Pass Christian on August 18, 1969.

• Hindcast 1-D modeling studies implicates Loop Current in the rapid intensification and severe strength.

From Divine Wind: The History and Science of Hurricanes by Kerry Emmanuel

Colorado Center for Astrodynamics Research OSTM SWT Meeting • 19 June 2008 • Buellton, CAUniversity of Colorado, Boulder

Monte Carlo Loop CurrentSimulation

Altimeter Mean LC Coverage Simulated Mean LC Coverage

Altimeter Loop Area Simulated Loop Area

Satellite-tracked Leatherback Turtles Data User: Dr. Tom Doyle of the Irish Sea Leatherback Turtle Project http://www.turtle.ie/ is using satellite altimetry to improveunderstanding of leatherback turtles in the Irish Sea.Application:. Uses sea surface height maps to interpret turtlemovement and migration patterns in relation to ocean mesoscaleeddy field.Altimeter Product Used: Near-real time and historical mesoscale sea surface height anomaly fields.


http://www.turtle.ie/

Leatherback Turtle Tracking


Turtle track overlaid on mesoscale SSHA

The large male turtle remainedwithin an anticyclonic eddyfor 66 days west of the Bay ofBiscane in late summer 2006.

A marked change in divebehavior occurred as the turtlefed, presumably on jellyfish,within the eddy.

Later this turtle dove to 1250meters depth southwest ofCape Verde islands, thedeepest ever recorded for a reptile.


Leatherback Turtle Tracks in Eddies


Examples ofloopingsegments ofleatherback turtle tracks superimposedon SSHA images(Luschi et al., 2003).

d) Turtleremained in cyclone forthree months.

Other Users/Applications

Insurance Claims Adjustors Marine Architects Fisheries Managers Commercial Fishermen Search and Rescue Ocean Circulation Nowcasts/Forecasts/Hindcasts Forensic Oceanographers


operational applications of satellite altimetry - ostm: home page

Documents